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a large population of laboratory animals has been allowed to breed randomly for a number of generations. after several generations, 49% of the animals display a recessive trait (bb), the same percentage as at the beginning of the breeding program. the rest of the animals show the dominant phenotype, with heterozygote individuals indistinguishable from the homozygous dominant individuals.what is the most reasonable conclusion that can be drawn from the fact that the frequency of allele b has not changed over time?a) the population is undergoing genetic driftb) the two phenotypes are equally adaptive under laboratory conditions c) the genotype BB is lethal d) there has been a high rate of mutation of allele B to allele b
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